7222781 has 2 divisors, whose sum is σ = 7222782. Its totient is φ = 7222780.

The previous prime is 7222771. The next prime is 7222799. The reversal of 7222781 is 1872227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5134756 + 2088025 = 2266^2 + 1445^2 .

It is a cyclic number.

It is not a de Polignac number, because 7222781 - 2¹⁰ = 7221757 is a prime.

It is a super-2 number, since 2×7222781² = 104337130747922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7222771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3611390 + 3611391.

It is an arithmetic number, because the mean of its divisors is an integer number (3611391).

Almost surely, 2^7222781 is an apocalyptic number.

It is an amenable number.

7222781 is a deficient number, since it is larger than the sum of its proper divisors (1).

7222781 is an equidigital number, since it uses as much as digits as its factorization.

7222781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3136, while the sum is 29.

The square root of 7222781 is about 2687.5232092021. The cubic root of 7222781 is about 193.3013181893.

The spelling of 7222781 in words is "seven million, two hundred twenty-two thousand, seven hundred eighty-one".